Hitachi UTOPIA RAS-4HVRP2E - Page 304

10 Troubleshooting
Troubleshooting in check mode
SMGB0136 rev.0 - 07/2021
302

Location of the pushswitches and the 7-segment display
The push-switches and the 7-segment display are located on PCB2 (RAS-(4-6)HV(R/N)(C/P)2E) and PCB1 (RAS-(4-6)
H(R/N)(C/P)2E).
YCH
(CH)
Y21
(RVR)
Y20A
(SVA)
Y20F
(SVF)
FAN1
FAN2
7-Segment Display
7-segment
Display

Protection control code on the 7-segment display
• A protection control code is displayed on the 7-segment display during the operation when the protection control has
been activated.
• A protection control code is displayed while the function is operating, and it is cancelled when it is released.
• When several protection controls are activated, the code number with the highest priority is displayed (see below for
the order of priority).
1 Higher priority will be given to the protection control related with the frequency control.
<1> Pressure ratio control <6> Low pressure decrease protection
<2> High pressure increase protection <7> Demand current control (running current limit control)
<3> Current protection <8> Low pressure increase protection
<4>Inverterntemperatureincreaseprotection <9> High pressure decrease protection
<5> Discharge gas temperature increase protection
2 Regarding the retry control, the lastest retry code will be indicated unless the protection control related with the
frequency control is indicated.
Code Protection control
P 1
Pressure ratio protection control
P 2
High pressure increase protection
P 3
Inverter current protection
P 4
Inverterntemperatureincreaseprotection
P 5
Discharge gas temperature increase protection at the upper part of the
compressor
P 6
Low pressure decrease protection
P 9
High pressure decrease protection
P A
Demand current protection control
P d
Low pressure increase protection
Code Retry control
P 7
Inverter trip retry control
P 8
Inverter voltage drop. Overvoltage retry control
? NOTE
• The retry indication is prolonged for 30 minutes unless a protection control is indicated.
• The retry indication disappears if the stop signal comes from all rooms.
• The protection control code indicated on the 7 segment display changes to an alarm code when the abnormal operation occurs. Also,
the same alarm code is indicated on the remote control.